A practical absolute wavelength meter was assembled separately a reference wavelength source and wavelength measurement system. The frequency (wavelength) stability was obtained to be 2×10-12 for a reference wavelength source. The other hand accuracy of wavelength measurement was estimated to be ** Michelson interferometer with vacuum chamber. The wavelength was estimated to be 1523.48813 nm for a 1523nm He-Ne laser as test laser. Moreover, the pressure dependence for wavelength was measured to be 0.0044 [pm/hPa]. Measurement reproducibility of the wavelength meter was guaranteed to be ±0.035pm.
An external cavity diode laser near 633 nm with Littrow configuration is constructed. With this laser and third order derivative technique, we have observed the iodine saturation absorption spectrum of P33 (6-3). The effect of different modulation width has been given.
In this paper, a preliminary result for an iodine frequency stabilized tunable diode lasers at 633 nm is reported. The frequency stability of the diode laser was 2 X 10-11, the tune ability was 10 nm and the line-width was 100 kHz. In addition, five groups of stronger hyperfine transitions of iodine molecule, which are available to be reference lines for diode laser frequency standard, beside the well-known transition R(127)11-5 at 633 nm region were observed by means of saturated absorption in the configuration of external iodine cell and their absolute frequencies were measured by a spectrum analyzer and a scanning Fabry-Perot cavity. The program for calculating the hyperfine structures and strength of transitions for rotational vibrational bands of iodine molecule was developed and the predictions for possible transitions around 633 nm including the transition strength are given.
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